IN Brief:
- The UK Health Security Campus has an approved programme envelope of £3.52bn through 2038.
- Construction is split between the specialist H50 high containment building and the wider main site.
- Early works are planned from 2028 before main construction starts in the fourth quarter of 2029.
The UK Health Security Agency has set out the construction and procurement structure behind its £3.52bn Health Security Campus in Harlow, with early works planned from 2028 and main construction scheduled to begin in late 2029.
The programme business case divides the physical development into two principal construction projects. The first is the H50 High Containment Building, a specialist bioscience facility incorporating Containment Level 3 and Containment Level 4 laboratories. The second is the wider main site, combining laboratories at several containment levels with offices and supporting campus infrastructure.
H50 carries some of the most demanding construction requirements within the programme because Containment Level 4 facilities are designed for work involving the highest risk pathogens handled by the agency. The proposed building includes suited CL4 laboratories, where scientists work in air supplied protective suits alongside engineered containment systems.
Delivering facilities of that type extends far beyond construction of the structural shell. Building services, pressure regimes, air handling, filtration, access control, decontamination, standby systems and validation all have to operate together before scientific activity can begin.
The business case identifies the limited UK supplier base for high containment construction as a programme risk, stating that only three UK suppliers can deliver CL4 facilities at the required scale. That constraint affects procurement as well as design because losing access to experienced specialist contractors can create a direct programme delay.
UKHSA therefore proposes to reinstate its preconstruction services agreement with Kier for H50 rather than procure the package again from the beginning. The business case estimates that restarting procurement could add between 12 and 18 months, creating pressure on both the critical path and access to the specialist supply chain.
The wider main site will follow a separate construction route. UKHSA plans a two stage Tier 1 procurement for a new main building, together with demolition of the existing main building to ground level.
Separating H50 from the broader campus package prevents the specialist containment building from becoming the sole delivery route for the entire development. It also allows the procurement and technical risk associated with the highest containment laboratories to be managed separately from conventional offices, lower containment laboratories and campus infrastructure.
Professional services are also divided into seven packages under the programme’s longer term delivery structure. Those packages are intended to provide the design, construction and programme capabilities needed as the scheme progresses from technical development through procurement, construction, commissioning and validation.
The financial plan shows why the programme extends beyond the cost of erecting laboratory buildings. Of the £3.52bn envelope, £3.022bn is identified as capital expenditure and £503m as revenue expenditure, with programme management, transition activity and operational preparation sitting alongside physical construction.
Combined capital and revenue risk allowance is stated at £516m net and £665m gross. Cost pressure is concentrated around H50, the Main Science Building, inflation and the specialist nature of the works, while around £130m of capital expenditure is associated with items outside the principal construction packages, including equipment, internal staffing and operation of the Harlow site.
The existing scientific estate at Porton Down and Colindale cannot simply close when the new structures reach practical completion. High containment laboratories must be commissioned and validated before live scientific programmes can transfer, while the existing facilities have to remain operational during that process.
UKHSA expects validation and dual running to begin in the first quarter of 2034, several years before final programme completion. That extended transition period means commissioning becomes a major delivery phase in its own right rather than an activity confined to the end of construction.
The programme also envisages moving as many as possible of roughly 2,500 roles currently based at Porton Down, Colindale and the agency’s London headquarters to Harlow. Personnel deployment is expected to begin in the mid-2030s, with the campus scheduled to be complete and in service by September 2038.
Early works are currently programmed from 2028, while the start of the main construction phase is scheduled for the fourth quarter of 2029. A further business case addendum is due in 2027 as design, procurement and annual spending profiles become more detailed.
The published structure provides a clearer view of how one of the UK’s most technically specialised public construction programmes will be divided. High containment work is being isolated into its own package, the wider campus will follow a separate Tier 1 route, and validation has been built into the programme years before final occupation.
